Index of first occurrence of n as a term in A001203, the continued fraction for Pi.

Terms

a(0) =4a(1) =9a(2) =1a(3) =30a(4) =40a(5) =32a(6) =2a(7) =44a(8) =130a(9) =100a(10) =276a(11) =55a(12) =28a(13) =13a(14) =3a(15) =78a(16) =647a(17) =137a(18) =140a(19) =180a(20) =214a(21) =83a(22) =203a(23) =91a(24) =791a(25) =112a(26) =574a(27) =175a(28) =243a(29) =147